Event generator tunes obtained from underlying event and multiparton scattering measurements

Authors

CMS Collaboration
Ekaterina CMS Avdeeva, CERNFollow
Kenneth A. Bloom, University of Nebraska-LincolnFollow
S. Bose, University of Nebraska-LincolnFollow
Daniel Claes, University of Nebraska-LincolnFollow
Aaron Dominguez, University of Nebraska-LincolnFollow
Caleb Fangmeier, University of Nebraska-LincolnFollow
Rebeca Gonzalez Suarez, University of Nebraska-LincolnFollow
Rami Kamalieddin, University of Nebraska-LincolnFollow
J. Keller, University of Nebraska-LincolnFollow
D. Knowlton, University of Nebraska-Lincoln
Ilya Kravchenko, University of Nebraska-LincolnFollow
F. Meier, University of Nebraska-Lincoln
Jose Monroy, University of Nebraska-LincolnFollow
F. Ratnikov, University of Nebraska-Lincoln
J. E. Siado, University of Nebraska-Lincoln
Gregory Snow, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

2016

Citation

Eur. Phys. J. C (2016) 76:155 DOI 10.1140/epjc/s10052-016-3988-x

Comments

© CERN for the benefit of the CMS collaboration 2016. This article is published with open access at Springerlink.com

Abstract

New sets of parameters (“tunes”) for the underlying-event (UE) modelling of the PYTHIA8, PYTHIA6 and HERWIG++ MonteCarlo event generators are constructed using different parton distribution functions. Combined fits to CMS UE proton–proton (pp) data at √s = 7 TeV and to UE proton–antiproton (pp) data from the CDF experiment at lower √s, are used to study the UE models and constrain their parameters, providing thereby improved predictions for proton–proton collisions at 13 TeV. In addition, it is investigated whether the values of the parameters obtained from fits to UE observables are consistent with the values determined from fitting observables sensitive to double-parton scattering processes. Finally, comparisons are presented of the UE tunes to “minimum bias” (MB) events, multijet, and Drell– Yan (qq → Z/γ*→lepton-antilepton+jets) observables at 7 and 8 TeV, as well as predictions for MB and UE observables at 13 TeV.